Test/tests/test_main.py

from unittest.mock import patch, call
import pytest

from src.main import run


def test_repl_dispatches_known_command(capsys):
    inputs = iter(["help", KeyboardInterrupt()])

    def fake_input(prompt):
        val = next(inputs)
        if isinstance(val, KeyboardInterrupt):
            raise val
        return val

    with patch("src.main.input", fake_input):
        run()

    captured = capsys.readouterr()
    assert "welcome to the best testapp ever" in captured.out
    assert "Available commands" in captured.out


def test_repl_unknown_command_prints_error(capsys):
    inputs = iter(["unknowncmd", KeyboardInterrupt()])

    def fake_input(prompt):
        val = next(inputs)
        if isinstance(val, KeyboardInterrupt):
            raise val
        return val

    with patch("src.main.input", fake_input):
        run()

    captured = capsys.readouterr()
    assert "Unknown command: unknowncmd" in captured.out
    assert "Type 'help' for available commands" in captured.out


def test_repl_empty_input_is_ignored(capsys):
    inputs = iter(["", KeyboardInterrupt()])

    def fake_input(prompt):
        val = next(inputs)
        if isinstance(val, KeyboardInterrupt):
            raise val
        return val

    with patch("src.main.input", fake_input):
        run()

    captured = capsys.readouterr()
    # Welcome message present, no "Unknown command" line
    assert "welcome to the best testapp ever" in captured.out
    assert "Unknown command" not in captured.out


def test_repl_input_is_case_insensitive(capsys):
    inputs = iter(["HELP", KeyboardInterrupt()])

    def fake_input(prompt):
        val = next(inputs)
        if isinstance(val, KeyboardInterrupt):
            raise val
        return val

    with patch("src.main.input", fake_input):
        run()

    captured = capsys.readouterr()
    assert "Available commands" in captured.out